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COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Operating Leases, Rent Expense | $ 79.9 | $ 80.0 | $ 90.1
Settlement Payment | $ 0.5 |  |

X
- Definition Amount of cash settlement made during the period. + References No definition available. + Details
Name: | atge_SettlementPayment
Namespace Prefix: | atge_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration